/*
 * (c) Copyright 2018 Palantir Technologies Inc. All rights reserved.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package com.palantir.atlasdb.keyvalue.cassandra;

import com.google.common.annotations.VisibleForTesting;
import com.palantir.atlasdb.keyvalue.api.KeyValueService;
import com.palantir.common.annotation.Idempotent;
import com.palantir.logsafe.Preconditions;
import com.palantir.timestamp.TimestampStoreInvalidator;

public final class CassandraTimestampStoreInvalidator implements TimestampStoreInvalidator {
    private final CassandraTimestampBackupRunner backupRunner;

    @VisibleForTesting
    CassandraTimestampStoreInvalidator(CassandraTimestampBackupRunner backupRunner) {
        this.backupRunner = backupRunner;
    }

    public static CassandraTimestampStoreInvalidator create(KeyValueService keyValueService) {
        Preconditions.checkArgument(
                keyValueService instanceof CassandraKeyValueService,
                "CassandraTimestampStoreInvalidator should be instantiated with a CassandraKeyValueService!");
        CassandraKeyValueService cassandraKeyValueService = (CassandraKeyValueService) keyValueService;
        return new CassandraTimestampStoreInvalidator(new CassandraTimestampBackupRunner(cassandraKeyValueService));
    }

    @Override
    @Idempotent
    public long backupAndInvalidate() {
        backupRunner.ensureTimestampTableExists();
        return backupRunner.backupExistingTimestamp();
    }

    @Override
    @Idempotent
    public void revalidateFromBackup() {
        backupRunner.ensureTimestampTableExists();
        backupRunner.restoreFromBackup();
    }
}
